měi / cì / huí / dào / mǔ / xiào / wǒ / dōu / gǎn / tàn / suì / yuè / rú / suō / xǔ / duō / lǎo / shī / yǐ / jīng / tuì / xiū / le

每次回到母校，我都感叹岁月如梭，许多老师已经退休了。

Whenever I return to my old school, I marvel at how quickly time passes; many teachers have already retired.